Ar<sup>+</sup> ion bombardment induced reduction effect on Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub> and Bi-Mo complex oxides, α-Bi<sub>2</sub>Mo<sub&...Ar<sup>+</sup> ion bombardment induced reduction effect on Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub> and Bi-Mo complex oxides, α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>13</sub>, β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>, and γ-Bi<sub>2</sub>MoO<sub>6</sub>, has been studied with XPS. The results show that, owing to the presence of the oxygen anion bridge in Bi（Ⅲ）-O（Ⅱ）-Mo（Ⅵ）, the reduction behavior of Bi（Ⅲ） and Mo（Ⅵ） metal ions in all the three complex oxides is contrary to that in the single oxides. While Mo（Ⅵ） in MoO<sub>3</sub> is reduced to Mo（Ⅵ） in UHV under Ar<sup>+</sup> ion bombardment, the valence state of Bi（Ⅲ） in Bi<sub>2</sub>O<sub>3</sub> is unchanged. However, Bi（Ⅲ） in the three complex oxides is reduced to Bi（0） without noticeable reduction of Mo（Ⅵ）. Nevertheless, the rates of Bi（Ⅲ） reduction are in correspondence with the difference in Bi/Mo atomic ratio and the crystallographic features of the three phases of bismuth molybdate are decreasing in the order of α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub>≥β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>】γ-Bi<sub>2</sub>MoO<sub>6</sub>. A new O -species is observed on the bismuth molybdate surface reduced by Ar<sup>+</sup> ion bombardment.Wc discuss the above phenomena展开更多
基金Project supported by the National Natural Science Foundation of China
文摘Ar<sup>+</sup> ion bombardment induced reduction effect on Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub> and Bi-Mo complex oxides, α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>13</sub>, β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>, and γ-Bi<sub>2</sub>MoO<sub>6</sub>, has been studied with XPS. The results show that, owing to the presence of the oxygen anion bridge in Bi（Ⅲ）-O（Ⅱ）-Mo（Ⅵ）, the reduction behavior of Bi（Ⅲ） and Mo（Ⅵ） metal ions in all the three complex oxides is contrary to that in the single oxides. While Mo（Ⅵ） in MoO<sub>3</sub> is reduced to Mo（Ⅵ） in UHV under Ar<sup>+</sup> ion bombardment, the valence state of Bi（Ⅲ） in Bi<sub>2</sub>O<sub>3</sub> is unchanged. However, Bi（Ⅲ） in the three complex oxides is reduced to Bi（0） without noticeable reduction of Mo（Ⅵ）. Nevertheless, the rates of Bi（Ⅲ） reduction are in correspondence with the difference in Bi/Mo atomic ratio and the crystallographic features of the three phases of bismuth molybdate are decreasing in the order of α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub>≥β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>】γ-Bi<sub>2</sub>MoO<sub>6</sub>. A new O -species is observed on the bismuth molybdate surface reduced by Ar<sup>+</sup> ion bombardment.Wc discuss the above phenomena
